Machine for continuously rolling bottom leather



g- 1957 A. BuEK 2,803,954

MACHINE FOR CONTINUOUSLY ROLLING BOTTOM LEATHER Filed Sept. 26, 1955 2Sheets-Sheet 1 IN VENTOR MMZMI Aug. 27, 1957 A. BuEK 2,803,954

MACEIINE FOR CONTINUOUSLY ROLLING BOTTOM LEATHER Filed Sept. 26, 1955 2Sheets-Sheet 2 INVENTOR MACHINE FOR CONTINUOUSLY ROLLING BOTTOM LEATHERAdolf Bucek, Otrokovice, Czechoslovakia, assignor to Svit, narodnipodnik, Gottwaldov, Gottwaldov, Czechoslovakia Application September 26,1955, Serial No. 536,509

Claims priority, application Czechoslovakia September 27, 1954 2 Claims.(Cl. 69-43) The present invention relates to machines for the continuousrolling of bottom leather by means of a plurality of rolling discs.

Hitherto, bottom leather has been rolled on bridge-type rollingmachines, wherein a cast iron disc with ground surface mounted in acarriage is imparted a reciprocating movement on the carrying structureof the machine. The leather placed on a steel plate is advanced by handin a direction perpendicular with regard to the movement of the disc insuch a way as to be successively rolled out evenly throughout itssurface. The rolling of the leather is proceeding in stripes of thewidth of the rolling disc, i. e. 100 to 150 mm.

Although such bridge-type machines are working, in general,satisfactorily, they present nevertheless a number of drawbacks so thatthey are no longer suitable to fulfil all the up-to-date requirements ofan increased productivity. Their chief disadvantage lies in their outputbeing relatively small, chiefly for that reason that the rolling disc isto roll with its whole surface 8 to 10 times over the leather in bothdirections for a convenient treatment of the whole surface of theleather.

A further disadvantage consists in the necessity of the reciprocatingmovement of the carriage with the rolling disc of a weight of over 1ton, on the carrying structure of the bridge. Therefore, a considerableinput of power is required at any change of its movement both on brakingand on re-starting its heavy mass. This leads to a heavy stress andpremature wear of the drive and reverse mechanism.

A further drawback lies in the lack of safety of the attendance, as itis scarcely possible to provide the moving rolling disc with a reliableguarding device. Any shielding of the rolling disc is a hindrance forthe supervision of the working post. Thus, the risk of accidentsoccurring is substantially increased.

The aforesaid drawbacks have now been eliminated by the arrangementaccording to the present invention consisting in that for the continuousrolling of the leather four or more rolling discs are used together withsupporting cylinders and feed cylinders arranged alternately behind eachother and side-byside in such a way that three of the rolling discslying behind each other are laterally staggered whilst two rolling discsare running in the same axis side-by-side.

Further features of the object of the present invention are obvious fromthe following description relating to an embodiment given merely by wayof example and illustrated in the accompanying drawing, wherein Fig. 1shows a diagrammatic longitudinal section of the rolling machine,

Fig. 2 a diagrammatic top view showing the arrangement of the cylinders.

Referring now to the drawings, the rolling discs 2, 3, 4

United States Patent and 5 are mounted in the frame not .illustrated ofthe machine on shafts 7, 8, 9 and 10 running in bearings 11, 12, 13 and14. Opposite these cylinders, thrust rollers 1 are arranged underneath(Fig. 1). Ahead of, and in between the rolling discs 2, 3, 4 and 5 andthrust rollers 1, pairs of feed (holding) rollers 6 are arranged so asto be pressed against each other from above by the effect of springs 15.The thrust rollers 1 are arranged in a well known manner continuouslybehind each other. The rolling discs 2, 3, 4 and 5 are arranged as shownin Fig. 2 alternately behind each other and side-by-side in such a waythat the leather having passed through the machine in the direction ofthe arrow P (Figs. 1 and 2) is evenly and smoothly rolled out throughoutits surface without leaving on the smooth face traces of stripes of thewidth of the rolling discs 2, 3, 4 and 5. The lower feed rollers 6 ofeach pair are turnable in fixed bearings whilst the upper feed rollers 6are spring-controlled so as to be able to follow and equalize anyunevennesses of the leather U resulting from drying. The feed rollerpairs 6 are placed ahead of the first and the last of the supportingrollers 1 for the purpose of guiding the leather straightly and ofholding it properly in place yet before the rolling operation and thenin course of the rolling operation and after passing through the rollingdiscs 4 and 5 to leave the machine in a straight and proper condition.

The rolling machine above described operates as follows:

The leather U is inserted according to Fig. 2 between the first pair offeed rollers 6 in the direction of the arrow P. After having beeninserted, the leather advances through the machine quite automatically,being treated by the rolling discs 2, 3 and 4 successively in its middleportion and thereupon both rim portions not illustrated of the leather Uare rolled out simultaneously by the discs 4 and 5. The rear feed rollerpair 6 thereupon pushes the finished leather out of the machine. Oninserting another leather between the first pair of feed rollers 6 inthe direction of the arrow P (Figs. 1 and 2.), the whole process ofrolling is repeated.

A very important advantage of the arrangement of the rolling discs 2, 3and 4 in series and of the discs 4 and 5 side-by-side consists in thefact that during the rolling operation the leather U is prevented fromshifting sidewise. Thus the formation of traces in the shape of thelongitudinal stripes of the Width of the rolling disc is avoided. Therolled out surface of the leather is entirely smooth and even and therims of the leather treated remain undisturbed even by the exertion ofthe maximum pressure so that the quality of the leather is greatlyincreased. The rolling pressures are adjustable within a very widerange, from zero up to 1,500 kg. per cm. of the width dealt with. Themachine can be operated by unskilled workers with absolute safety.

I claim:

1. Machine for continuously rolling leather, comprising four pairs ofopposed working rollers to rotatably act upon leather fed between therollers, all of the rollers rotating about parallel axes, two of saidpairs being located centrally of the width of the work passage throughthe machine and being of such width as to act substantially on thecenter portion only of the leather, said two pairs being arranged tofollow each other, when viewed in the feeding direction of the work, andto be laterally staggered and in laterally overlapping relation withrespect to each other, the other two pairs of rollers being arranged tofollow the first named two pairs, and located at the edge portions ofthe work passage, and acting substantially r-ltwopairsextendingcoaxially and being spaced axially upon the marginal portions only ofthe leather, said latter rolls both in advance of the first named twopairs and after the second named two pairs.

apart, each of the second named two pairs being in a laterallyoverlapping relation with ,respect to one of the first named two pairs.

2. In the machine according to claim 1, a pair of feeding rollspositioned between each two successive positions of working rollers, andatleast a single pair of feeding 2,538,086

References Cited in the file of this patent UNITED STATES PATENTS2,399,819 Moore May 7, 1946 Dennison Ian. 16, 1951

